cc-settings-icon BUILD AT HOME
80% Arms sells AR-15 and .308 80% Lower Receivers, 80% Lower Jigs and other accessories which allow you to legally build a firearm at home in most states.
We utilize state of the art 5-axis CNC machines to mill all our .308 and AR-15 80 percent lower receivers to incredibly precise tolerances using premium billet aluminum.
We also offer our patented AR-15 and .308 Easy Jigs® which is the first 80% lower jig that makes it ridiculously easy for a non-machinist to finish their 80% lower in under 1 hour with no drill press required.
Products manufactured by 80% Arms carry a lifetime warranty against manufacturing defects. We will promptly replace or repair any product that we determine to be defective.

10.5" 5.56/300BLK AR-15 Upper - Customizable

$399.00 - $441.98
Barrel Option for 10.5" 5.56/.300BLK
Muzzle Selection for 5.56/.300BLK
Calculated at Checkout


Norton Shopping Guarantee


To compliment our 80 lowers, we offer AR15 complete uppers assembled in-house which will work perfectly for your next build. This complete upper features a free-floating 10” handguard and a 10.5” parkerized barrel chambered in your choice of 5.56 NATO or 300 Blackout (select above). 

Each AR15 complete upper from 80% Arms includes a preinstalled forward assist, dust cover, bolt carrier group, and charging handle.

All of our uppers are assembled with parts that are proudly made in the USA. In our QC inspections, we also make sure that each complete upper is torqued to Mil-spec standards so that they’ll be plug-and-play ready for your next AR15 lower to pair.


  • 10.5” Heavy Barrel Profile, Parkerized Finish

  • .750” Fixed Gas Block and Gas Tube

  • A2 Style Birdcage Flash Hider

  • 10” M-LOK Handguard

  • 7075-T6 Forged AR15 Upper Receiver (Forward Assist/Dust Cover Installed)

  • HP/MPI Tested Bolt Carrier Group, Black Nitride Finish

  • Mil-Spec Charging Handle

  • Optional Upgrade: Compact Muzzle Brake 


5.56mm NATO or .300BLK?

A common question! It really comes down to what you want to do with it. If you are looking for a harder-hitting round up close, that suppresses extraordinarily well, then you're looking for the .300BLK. If you would like a little extra reach with a flatter shooting cartridge, the 5.56mm is what you're looking for. Any more questions on the subject? Read our blog post on the best AR 15 calibers.

Muzzle Device

A2 Style Flash Hider or Compact Muzzle Brake? While mostly a matter of looks or preference, some states have outlawed A2 Style Flash Hiders or consider them to be "evil features", contributing toward what may or may not be considered an "assault rifle" under the definition of state law. Be sure to read and understand your local laws. 

Aside from the legality, there are benefits in looks and performance when choosing a Compact Muzzle Brake. Muzzle brakes, besides looking cool, divert the gases exiting the barrel in such a way that reduces recoil and muzzle rise, and can improve follow-up shot speed. Check out our blog on muzzle brakes for more information.

Shipping Restrictions: 

We do not ship this product to the following states: California, Colorado, Connecticut, Hawaii, New Jersey, New York, Rhode Island, and Washington D.C.